Răspuns:
Explicație pas cu pas:
Ex 13:
a) 15/40; 15/42; 15/45; 15/48.
x € {0,2,5,8}
b) 51/21; 54/21; 56/21; 57/21;
x € {1,4,6,7} asa faci si la celelalte.
c) 35/60; 35/63; 35/65;
d) 81/63; 84/63; 87/63
Ex 14:
a) 20/14; 21/14; 22/14; 24/14; 26/14;
b) 45/50; 45/51; 45/54; 45/55; 45/57;
c) 30/75; 33/75; 35/75; 36/75; 39/75;
d) 42/80; 42/81; 42/82; 42/84; 42/86; 42/87; 42/88.